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LAMM LL2.1 Zoom


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SKU: LL2.1
The LL2.1 is a direct replacement for the LL2 preamplifier. The LL2.1 features the following upgrades and modifications as compared to the LL2:

•addition of a built-in remote on/off for LAMM amplifiers

•introduction of the attenuation for gain reduction by 15 dB

•some new parts

•new knobs

•slight changes in schematic diagram

Model LL2.1 is the next generation of the original LL2 which was the first in the line of LAMM vacuum tube preamplifiers. Unique topology and application of the most advanced technological resources and processes bring the LL2.1 very close to the threshold of excellence in sound reproduction. A main distinction of the LL2.1 from any other comparable type of preamplifiers is its almost inaudible sonic signature. When connected to an appropriate type of power amplifiers, especially LAMM amplifiers, it assures the recreation of a three-dimensional soundstage without boundaries and limitations.

1 The LL2.1 features a topology that brings out the most natural sound performance in the audio path, as well as graceful and sophisticated design. It employs a pure class A operation from input to output; all stages are single-ended. The preamplifier's audibly neutral power supply features a full-wave vacuum rectifier. This rectifier, together with a choke-containing filter, allows to practically get rid of the hum and buzz and, in the end, to ensure the verity of dynamic range without coloration. Other features include 3 inputs; 1 tape loop; 2 sets of outputs; front panel muting switch; attenuator for gain reduction by 15 dB; built-in remote on/off for LAMM power amplifiers; protection circuitry coupled with automatic mute at turn on/off.

Each preamplifier is carefully hand-crafted with matched components of the highest quality, some of which include military graded low noise DALE metal film resistors; NOBLE potentiometers; ELECTROCUBE and ROEDERSTEIN film capacitors; high frequency switching grade CORNELL DUBILIER electrolytic capacitors; and specially selected long life vacuum tubes. The LL2.1 features a custom-designed power transformer.

1The LL2.1 is available in two versions: standard and deluxe,
both of which utilize identical chassis, PC-board and parts.
In deluxe version, the power supply energy storage is approximately twice that of the standard version (four identical light-blue capacitors next the choke; only two of these are installed in regular version -- see first detail image insert).
Also, in deluxe version, all film capacitors in critical paths are paralleled by polystyrene capacitors of the highest available quality (yellow capacitors on two images -- right and below).

Availability: In stock

Product Description


    Untitled 1



    Rated Output Voltage*


    from 20Hz-20KHz:

               1.0 Volts

    Voltage Gain


                7.87 + 2% or 17.92 + 0.2dB.


                5.62 ± 10% or 15 ± 0.85dB.

    Frequency Response


    from 1-30 Volts RMS:

    (+ 0dB) 20 Hz, 20 KHz.
    (- 3dB) 1.5 Hz, 400 KHz.

    Slew Rate


    Vout=28.8 Volts peak-to-peak of
    square-wave signal, F=10KHz:

    41 Volts per microsecond

    Rise Time


    Vout=28.8 Volts peak-to-peak of
    square-wave signal, F=10KHz:

    1 microsecond

    Total Harmonic Distortion from 20 Hz - 20 KHz


    Vout = 2 Volts RMS:
    Vout = 30 Volts RMS:

    no more than 0.03%
    no more than 1%

    IM Distortion 
    (60Hz:7KHz  4:1) SMPTE:


    Vout = 2 Volts RMS:
    Vout = 30 Volts RMS into IHF load:

    no more than 0.03%.
    no more than 1%.




    gold plated single-ended RCA connectors.

    Input Sensitivity*

      Vout = 1.0 Volts RMS:

    0.127 Volts RMS ± 2%.   

    Input Impedance

    50 KOhms + 10%.


    gold plated single-ended RCA connectors.

    Corrected Output Impedance


    typically 250 Ohms.



    signal-to-noise ratio, below 2 Volts RMS output, unweighted

    signal-to-noise ratio, below 2 Volts RMS output, A-weighted

    better than 84 dB.

    better than 94 dB.

    Operating Temperature



    -4 to +104 degrees Fahrenheit 
    (-20 to +40 degrees Celsius) ambient.

    Power Supply


    nominal line voltage:

    Input voltage range:

    100-240 Volts, 50/60Hz.  


    One power transformer, one filter choke, one full-wave vacuum rectifier, one solid-state analog non-switching voltage regulator.

    AC voltage intensively filtered by special RFI power line filter.

    Front/Rear Panel Controls: 


    Front Panel Controls:

    • POWER switch.
    • REMOTE switch.
    • MUTING switch.
    • LEFT GAIN control.
    • RIGHT GAIN control.
    • ATTENUATOR (-15 dB) switch.
    • SELECTOR switches.
    • MONITOR switch.
    • LED control.

    Rear Panel Connectors and Controls:

    • IEC 320 POWER INLET (3 lug).
    • EARTHING POST (gold plated).
    • REMOTE CONTROL plug.
    • Four pairs of INPUT CONNECTORS RCA for Line and Tape inputs.
    • Three pairs of OUTPUT CONNECTORS RCA for Tape, Output 1, and Output 2.



    Pure class A vacuum tube design. All stages are single-ended.

    High-current drive capability, in combination with unique single-ended class A circuitry, guarantee the preamplifier to drive any cable and any reasonable real world load, while maintaining its practically inaudible sonic signature.

    This design is unique to LAMM INDUSTRIES, INC.

    AC voltage selector:

    100/120/220/230/240 Volts, internally switchable.


    Unique electronic protection circuit enables muting of the outputs until the preamplifier is stabilized after a turn-on, as well as functioning of the preamplifier in a "muting" mode during operation and automatic switching to muting in case the AC line drops or is interrupted.

    AC voltage fuses:

    1 Amp slo-blo for 100/120 Volts,
    0.5 Amps slo-blo for 220/230/240 Volts



    Power Consumption:

    Typically 40 Watts.  

    Burn-in Time at Factory:

    Minimum 72 hours.

    Recommended Burn-in Time in End-user's System:

    Minimum 50 hours.

    Warm-up time:

    Minimum 45 minutes.

    Unit dimensions
    (preamplifier and power supply have the same dimensions):

    Crate dimensions:

    4.5 inches high x 19 inches wide x 13.875 deep + 1.375 inches for front handles.

    23" x 19" x 10" (58.42cm x 48.26cm x 25.4cm)

    Unit weight:

    Shipping weight:

    20 Lbs (9.1 Kg).  

    36 Lbs (16.3 Kg).

    Tube Complement:

    • V101 - 12AU7A (left channel, first amplification stage)
    • V103 - 6DJ8 (left channel, second amplification stage)
    • V102 - 12AU7A (right channel, first amplification stage)
    • V104 - 6DJ8 (right channel, second amplification stage)
    • V105 - 6X4/6202 (full wave voltage rectifier)
Additional Information

    Additional Information

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